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Coincidence method for outgoing transmission lines in isolated grids with wind power adapted to three-phase tripping

A technology of sending out lines and isolated grids, which is applied in the reclosing field including the isolated grid operation of wind power grids. It can solve the problems of small systems failing to meet the requirements of inspection synchronization, failure of reclosing, frequency and voltage of isolated grids exceeding limits, etc. Allowable closing time and frequency, improve the success rate, and ensure the effect of stable operation

Active Publication Date: 2018-03-02
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to address the above problems, to propose a method for reclosing the outgoing line with wind power isolated grid operation that is suitable for the formation of three-phase tripping, so as to solve the problem of short-circuit faults in the outgoing line due to the existence of surplus power. The frequency and voltage of the isolated grid with load including the wind farm quickly exceeded the limit, and the small system side could not meet the synchronization inspection requirements, resulting in the failure of reclosing

Method used

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  • Coincidence method for outgoing transmission lines in isolated grids with wind power adapted to three-phase tripping
  • Coincidence method for outgoing transmission lines in isolated grids with wind power adapted to three-phase tripping
  • Coincidence method for outgoing transmission lines in isolated grids with wind power adapted to three-phase tripping

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Embodiment 1

[0039] Such as image 3 As shown, a method to adapt to the three-phase tripping formation of a wind power outgoing line for isolated grid operation includes the following steps:

[0040] Step 1. When the transmission line of the isolated grid with load including wind power fails, the protection quick-break action three-phase trip, at this time, the output of various generators in the isolated grid remains unchanged, and the load remains unchanged; that is, the conventional power injection power in the isolated grid P 0 , Wind farm injected power P f And load P load No change; the transmission power sent out before the detection of the fault is the surplus power △P 1 , Where △P 1 =P f +P 0 -P load ;

[0041] Step 2. Determine the above surplus power △P 1 Power injected with wind farm P f Size: If the wind farm injected power P f Greater than surplus power△P 1 , The high-frequency cut-off method is adopted for the wind farm to reduce the injected power P of the wind farm f , Reduce t...

Embodiment 2

[0058] Such as figure 1 , figure 2 As shown, the installed capacity of the wind farm on the isolated grid side is 30MW, each wind turbine output is 1.5MW, the generator G1, the generator G2 and the generator G3 are all conventional energy sources, the installed capacity is all 50MW, the initial power angle of the generator is 25°, and the power generation Rotor time constant T j = 6s. After a three-phase fault occurs at point f, the protection action trips, and the surplus power of the isolated grid transmission line including the wind farm at this time is detected △P 1 ;Compare △P 1 Power injected with wind farm P f the size of.

[0059] Surplus power△P 1 Greater than the injected power P of the wind farm f ; Since the initial power is greater than the injected power of the wind farm, you can consider removing all wind power at this time, and reduce the injected power of the wind farm to 0, and determine the surplus power △P at this time 2 ; Based on the equal area rule (Accel...

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Abstract

The invention discloses a wind-power-contained isolated grid running outgoing line reclosing method adapting to formation of three-phase tripping operation. When a wind-power-contained isolated grid running outgoing line with loads breaks down, protection quick-breaking action three-phase tripping is achieved; the transmission power, namely the surplus power delta P1 of the outgoing line before the line breaks down is detected; the values of the surplus power delta P1 and the wind power field injection power Pf are judged; the final surplus power delta P2 of the outgoing line is determined, the delta Pmax is calculated through an equal area method, the delta P2 and the delta Pmax are compared, the maximum tripping frequency and the maximum tripping time are calculated, the allowed tripping time and frequency of the isolated grid outgoing line are enlarged, the time of normal running state recovering of the wind-power-contained isolated grid with the loads is shortened, and the problems that due to existence of the surplus power, the frequency and voltage of the wind-power-contained isolated grid with the loads formed after the outgoing line has a short-circuit fault and three-phase tripping of a breaker happens are out of limit rapidly, the small system side can not meet the synchronism check requirement, and reclosing fails are solved.

Description

Technical field [0001] The present invention relates to the field of wind power generation, and in particular to a method for reclosing output lines of isolated wind power grids that are adapted to three-phase tripping. Background technique [0002] At present, my country is rich in wind resources and concentrated in wind farms and wind areas. Wind power is connected to the nearest distribution network in a decentralized manner to absorb part of the electric energy locally, which reduces the pressure of long-distance high-voltage power transmission to a certain extent. The connection of wind power has brought many new problems to the grid. For isolated grids containing wind power with load, it is equivalent to injecting an unstable power into the grid that can maintain its own stability. Due to the injection of unstable factors, it will inevitably affect the original The power balance has an impact, which puts forward new requirements for both protection and reclosing. Due to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02J3/38
CPCY02E10/76
Inventor 路亮何世恩辛超山周强李凤婷张金平王婷王月林柴海涛
Owner STATE GRID CORP OF CHINA
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